Delete unused method FilesystemInterface::IsAbsent.

webrtc/rtc_base/fileutils.h

Index: webrtc/rtc_base/fileutils.h
diff --git a/webrtc/rtc_base/fileutils.h b/webrtc/rtc_base/fileutils.h
index a4a94727aa4b914ee8793e3a273c43d7a19e1f79..ba4b28995e3117ae645de174c762fa4af0b90bd6 100644
--- a/webrtc/rtc_base/fileutils.h
+++ b/webrtc/rtc_base/fileutils.h
@@ -98,10 +98,6 @@ class FilesystemInterface {
   // Returns true if pathname refers to a file
   virtual bool IsFile(const Pathname& pathname) = 0;
 
-  // Returns true if pathname refers to no filesystem object, every parent
-  // directory either exists, or is also absent.
-  virtual bool IsAbsent(const Pathname& pathname) = 0;
-
   virtual std::string TempFilename(const Pathname &dir,
                                    const std::string &prefix) = 0;
 
@@ -147,10 +143,6 @@ class Filesystem {
     return EnsureDefaultFilesystem()->IsFile(pathname);
   }
 
-  static bool IsAbsent(const Pathname &pathname) {
-    return EnsureDefaultFilesystem()->IsAbsent(pathname);
-  }
-
   static std::string TempFilename(const Pathname &dir,
                                   const std::string &prefix) {
     return EnsureDefaultFilesystem()->TempFilename(dir, prefix);